Question

An apple can provide a person about 20, 000 J of work. To what height can a 50 kg man climb upstairs if he ate one apple? *

Answer 1

Given,

An apple provide a person about 20,000 J of work

Mass of the person = 50 kg

To Find,
Height up to which the person can climb after eating one apple.

Solution,

The energy spent climbing upstairs is equal to the work done in climbing.

Energy spent = Work done

Therefore energy spent is equal to

20000 = m g h

20000 = 50 x 10 x h

h= 20000/500

  = 40 m

Hence, the person can climb up to a height of 40m after eating an apple.

Answer 2

Given - Work and mass

Find - Height

Solution - The formula relating the mentioned variables are - Work = mass*acceleration due to gravity*height

Taking acceleration due to gravity as 10 m/s². Keep the values in formula to find the height.

$20000 = 50 \times 10 \times h$

Performing multiplication and shifting the values to denominator on other side of equation.

$h = \frac{20000}{500}$

Performing division

$h = 40 \: m$

Hence, the person can climb to the height of 40 metres.